CyanogenMod 10 is still cooking, and heck, CM9 isn't even fully baked for all devices yet. That hasn't stopped Steve Kondik, aka the guy who puts the Cyanogen in CyanogenMod, from posting preview builds of CM10 over on XDA for the AT&T and T-Mobile Galaxy S III variants. Plus, a third preview build being posted for the Sprint version by another developer. Keep in mind, of course, that "preview build" translates into "absolutely nothing is guaranteed to work." It is exciting, nonetheless.